4

Si     -0.081478424868154      0.191786186075249      0.178955182286135
Si      1.791408711356922      1.614553590633172      0.095835081747139
Si      1.649046894850527      0.106092939059209      1.403494394236401
Si     -0.194019751429673      1.321575979200357      1.513615980846801